Diodes AP3612 - Manual (Page 8)

Preliminary Datasheet
Boost Type LED Driver with 12-Channel Current Source AP3612
Aug. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited
8
Electrical Characteristics (Continued)
V
IN
=24V, V
EN
=5V, Typical T
A
=25°C, unless otherwise specified.
Parameter Symbol Conditions Min Typ Max Unit
POWER SWITCH DRIVE
Current Limit Threshold Voltage V
LIMIT
480 540 600 mV
D/L Short Threshold Voltage
(Note 3)
V
LIMIT2
720 800 880 mV
Current Sense LEB Time
(Note 3)
t
LEB
80 100 150 ns
COMPENSATION AND SOFT START (COMP PIN)
Error Amplifier
Trans-conductance
G
EA
2300 µA/V
Sourcing Current I
O_H
V
COMP
=0.5V 80 120 160 µA
Sinking Current I
O_L
V
COMP
=2V 80 120 160 µA
OVER VOLTAGE PROTECTION
OVP Threshold Voltage V
OVP
V
OUT
Rising 1.9 2.0 2.1 V
OVP Hysteresis V
OVP_HYS
250 mV
Shutdown Under Abnormal
Condition
V
OVP-SH
3.0 3.2 3.4 V
CURRENT SOURCE
LED Current Matching between
Each String (Note 4)
I
CH_MATCH
I
CH
=60mA 1.5 4 %
Regulation Current per Channel I
CH
R
ISET
=6.667k Ω 55 60 65 mA
Minimum LED Regulation
Voltage
V
LED_REG
I
CHX
=60mA 400 mV
CH1 to CH12 Leakage Current I
LED_LEAK
V
EN
=0V,
V
LED
=37V
0.1 1 µA
LED Short Protection Threshold V
LED-S
6.6 7.3 8.0 V
OVER TEMPERATURE PROTECTION
Thermal Shutdown Temperature
(Note 3)
T
OTSD
160 ºC
Thermal Shutdown Recovery
(Note 3)
T
HYS
140 ºC
Note 3: Guaranteed by design.
Note 4: % 100
2 _
Ч
Ч
−
=
AVG
MIN MAX
MATCH ST
I
I I
I